* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

html, body {
    width: 100%;
    height: 100%;
    background: #1a1a2e;
    overflow: hidden;
    overscroll-behavior: none;
    position: fixed;
    top: 0;
    left: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    /* Safe-area padding for notched phones */
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

#gameCanvas {
    display: block;
    max-width: 100vw;
    max-height: 100vh;
    width: auto;
    height: auto;
    touch-action: none;
    cursor: pointer;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
    border-radius: 4px;
    image-rendering: -webkit-optimize-contrast;
}

/* Hide the rotate message by default; only show on phones in landscape */
#rotateMsg {
    display: none;
    position: fixed;
    inset: 0;
    background: #1a1a2e;
    color: #fff;
    z-index: 1000;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 20px;
    font-size: 18px;
    line-height: 1.5;
}

#rotateMsg .rot-icon {
    font-size: 64px;
    margin-bottom: 20px;
    animation: spin 2s ease-in-out infinite;
}

@keyframes spin {
    0%, 100% { transform: rotate(-15deg); }
    50% { transform: rotate(15deg); }
}

/* Show rotate prompt only on phones in landscape */
@media (orientation: landscape) and (max-height: 500px) {
    #rotateMsg { display: flex; }
    #gameCanvas { display: none; }
}